Medium length injectors are for use in GT500 or Ford GT. We also use the MU32 in our 3v supercharger kits.

The long injectors are the more common length and are applicable to all non-GT500 Mustangs since multi-port injection was introduced

Need help determining which injector you require for your application? Refer to EFI Tech Tips

About electrical connectors:

The USCAR connector is sometimes referred to as EV6, which is a Bosch term for the generation of injector.

Jetronic is the older style connector, sometimes referred to by the Bosch generation EV1.

Neither EV1 or EV6 is technically correct because those generations of Bosch injectors could come with either connector. However most EV1 injectors commonly available use the Jetronic connector and most EV6 injectors commonly available use the USCAR connector.